All P0 codes are generic trouble codes across makes. The ones you have are for cylinders 1 -3 misfires. I have not seen the "B" on the end of P0301 before. Check manual that came with your OBDII scanner to see if that notation is specific to the scanner in some way.
P1300 and P1319 are manufacturer specific. They may well have to do with your coils, however thats just conjecture based on your having a multi-cylinder misfire. I scanned the LR RAVE CD for more detail on these codes and they are not supplied. Unless someone on this board knows it or has a workshop manual with an OBDII section that has them, you'll need a dealer diagnosis before you make repairs - e.g. replacing plugs and wires may not be necessary if the only problem is w a coil.
If it is a coil problem, the Range Rover has 2 coil packs which are located in a tight spot on the back of the engine - hard to get to as they are obscured by the intake manifold and right up against the firewall. To replace one you probably have to remove the intake manifold.
Cylinders 2,3,5 and 8 are provided spark by one coil pack, I believe that internal to the pack, 2 and 3 are provided spark by the same actual coil. Anyway there are 2 coil packs, each has 2 coils, each coil serves spark to 2 cylinders. It could be that 2&3 are actually misfiring due to problem w coil, and this is causing a false reading on cyl 1 misfiring. Point is you won't really know until those P1 codes are diagnosed. A replacement Bosch coil pack for 99 - 04 P38 4.0 or 4.6 is 99.95 at ATL British.
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Pat Herman
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